Thermochemics and kinetics of the hot dip galvanizing reaction by electrochemical method.

电化学方法热浸镀锌反应的热化学和动力学。

• 批准号: 06650835
• 负责人: YAMAGUCHI Shu
• 金额: $ 1.34万
• 依托单位: Nagoya Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06650835/
• 关键词: Chemical potential; Hot dip galvanizing; Activity; CGL; Aluminum; Phase stability; Phase diagram; Phase transformation; 溶解亜鉛メッキ; ドロス; 濃淡電池; Fe; Zn

Thermochemical properties of liquid Zn-Al-Fe ternary alloys equilibrated with so-called dross phases, which are solid Fe-Zn and Fe-Al intermetallic compounds, have been made by an emf method using Al concentration cell composed of composite mixed chloride and sodium beta-alumina solid electrolytes.The construction of the cell can be expressed as follows.JA01HYThe emf of the cell is written by the following Nernst's equation.JA02SUThe chemical potential of Al in the alloys has been obtained as a function of temperature from the emf measurements, and the potential diagram has been constructed to illustrate the stability domain of the intermetallic compounds in equilibrium with liquid phses as functions of Al potential and temperature.The present results indicate that the delta+Fe_2Al_5+liq. threephase region, which corresponds to the boundary of the stability domain of delta_1 and Fe_2Al_5, branches into GAMMA_1+Fe_2Al_5+liq. regions at 460ﾟC,suggesting that GAMMA_1 phase becomes stable … More below this temperature. The GAMMA_1 phase showed marked grain growth and the solubility of Al was found to be higher than thatin delta_1 phase. From the comparison of metallographic observation of both GAMMA_1 and delta_1, the present author suggest the mechanism of transformation and growth of GAMMA_1 phase from delta_1 phase. The present observation that the GAMMA_1 phase can coexist with liquid phase was also confirmedby the results that the bottom dross sampled at CGL pot was the single phase of GAMMA_1. Also suggested by the inflection of emt-temperature relationship was the possible existence of the higher order transition in delta_1 phase, which is termed as delta'_1 phase, and the stability domain of delta'_1phase is illustrated in the potential stability diagram. Details of the structural information of this phase, however, is not fully established at this moment. Further discussion has been made based on the compositional analysis of the dross sample by illustrating the isothermal section of the ternary composition phase diagram with the comparison with the previous reports. Based on both potential stability diagram and the composition diagram, experimental results for simultaneous measurement of spatial distribution of both temperature and Al potential in the CGL pot has been analyzed, and the formation mechanism of GAMMA_1 phase in the pot hasbeen discussed in conjunction with the surface damage by the grain-grown dross particles suspended in the molten zine in the pot. Less

液态Zn-Al-Fe三元合金与所谓的浮渣相平衡时的热化学性质，浮渣相是固态Fe-Zn和Fe-Al金属间化合物，用混合氯化物和β-氯化钠组成的铝浓差电池，该电池的结构可表示如下：JA 01 HY电池的电动势由以下能斯特方程表示：JA 02 SU电池的电动势由以下能斯特方程表示：JA 02 SU电池的电动势由以下能斯特方程表示：由电动势测量得到了Al在合金中的化学势随温度的变化关系，并绘制了Al势和温度对金属间化合物与液相平衡的稳定域的影响图，结果表明：δ +Fe_2Al_5+liq.三相区对应于δ_1和Fe_2Al_5稳定域的边界，分支为γ_1 +Fe_2Al_5+liq。在460 ℃时，出现了一个稳定的区域，这表明在460 ℃时， ...更多信息 低于这个温度。结果表明，在γ_1相中，晶粒明显长大，Al的固溶度高于δ_1相中的固溶度。本文通过对δ_1相和γ_1相的金相观察比较，提出了δ_1相转变为γ_1相的机制。CGL罐底浮渣为单一相的实验结果也证实了目前的观察，即<$MA_1相可以与液相共存。EMT-温度关系曲线的拐点还表明δ_1相可能存在高阶相变，称之为δ ′_1相，并在势稳定图中给出了δ ′_1相的稳定区域。然而，这一阶段的结构信息的细节目前还没有完全确定。在对浮渣样品进行成分分析的基础上，通过绘制三元相图的等温截面图，并与以往的报道进行了比较，对浮渣的成分分析作了进一步的讨论。本文根据电位稳定图和成分图，分析了同时测量CGL坩埚内温度和铝电位空间分布的实验结果，并结合坩埚内悬浮于锌液中的晶粒长大浮渣颗粒对坩埚表面的损伤，讨论了坩埚内Gamma_1相的形成机理。少

项目成果

菊地英文ほか: "亜鉛溶アルミ濃度センサーの溶融亜鉛メッキ設備への適用方法の検討" 材料とプロセス(CAMP-ISIJ). 8. 658 (1995)

Hidefumi Kikuchi 等人：“锌熔铝浓度传感器在热浸镀锌设备中的应用研究”材料与工艺 (CAMP-ISIJ) (1995)。

山口 周ほか: "Phase Stability of Dross Phases in Equilibrium with Liquid Zn Measured by Al Sensor" Proc.of Galvatech '95. 1995. 787-794

Shu Yamaguchi 等人：“通过 Al 传感器测量的液态锌平衡中的渣相的相稳定性”Proc. of Galvatech 95。787-794

S.Yamaguchi, A.Sakatoku, H.Makino, Y.Iguchi: "Phase Equilibria between Intermetallic Compounds in Hot Dip Galvanizing Bath using Al Concentration Cell." Proc.of Internt'l Symp.on Extraction and Application of Zinc & Lead, (Sendai). 880-889 (1995)

S.Yamaguchi、A.Sakatoku、H.Makino、Y.Iguchi：“使用铝浓缩池的热浸镀锌槽中金属间化合物之间的相平衡”。

山口 周ほか: "Develeopment of Al Sensor in Zn Bath for Continuous Galvanizing Processes" Proc.of Galvatech'95. 647-655 (1995)

Shu Yamaguchi 等人：“用于连续镀锌过程的锌浴中铝传感器的开发”Proc. of Galvatech95 (1995)。

山口 周ほか: "亜鉛浴と平衡するドロスの相平衡" 材料とプロセス(CAMP-ISIJ). 8. 1555 (1995)

Shu Yamaguchi 等人：“锌浴平衡中的浮渣的相平衡”材料和工艺 (CAMP-ISIJ) (CAMP-ISIJ)。